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U.S. and Iran Jostle Before Nuclear Talks

The U.S. and Iran are staking out increasingly entrenched and opposing positions over Tehran's nuclear program, threatening the prospects of a vital foreign policy initiative of President Barack Obama.

WASHINGTON—The U.S. and Iran are staking out increasingly entrenched and opposing positions over Tehran's nuclear program, threatening the prospects of a vital foreign policy initiative of President Barack Obama.

The U.S. Treasury Department on Thursday announced new enforcement actions against companies with links to Iran for allegedly evading American sanctions against the country and aiding its nuclear and missile programs. The...